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Yasmina Amalia
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INDONESIA
Journal of Metallurgical Engineering and Processing Technology
Published by Universitas Pembangunan Nasional Veteran Yogyakarta
ISSN : 27236854     EISSN : 27981037     DOI : https://doi.org/10.31315/jmept
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering
Journal of Metallurgical Engineering and Processing Technology diterbitkan oleh Program Studi Teknik Metalurgi, Fakultas Teknologi Mineral, Universitas Pembangunan Nasional "Veteran" Yogyakarta. Journal of Metallurgical Engineering and Processing Technology terbit dua kali dalam satu tahun, yaitu Februari dan Agustus. Fokus dan ruang lingkup Journal of Metallurgical Engineering and Processing Technology adalah Pengolahan Mineral, Batubara, Metalurgi Ekstrasi, Metalurgi Fisika, Metalurgi Mekanik, dan Pengelolaan Mineral
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 129 Documents
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Gold Extraction Process with Base-Case Sample and Aachen Assisted Leaching (AAL) using Running Aachen at The Mineral And Coal Testing Center Tekmira, Bandung Jawa Barat Brilian, Oktavio Yorris; Wahyuningsih, Tri
Journal of Metallurgical Engineering and Processing Technology Vol 4, No 2 (February 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v4i2.11337

Abstract

The Center for Mineral and Coal Testing is an institution that works in the field of research services on mining and mineral processing. In the mineral processing research currently being carried out there is a research project related to increasing the efficiency of the leaching process using the Aachen Reactor. The samples used in this research were refractory gold samples. The problem of reducing the effectiveness of gold leaching is that there are minerals that are still included in the associated minerals, therefore a pre-treatment process is needed to remove these associated minerals. The Aachen reactor will help increase the efficiency of the leaching process by increasing Dissolve Oxygen levels to 30 ppm. In this study, two samples were used for comparison, namely the Pre-Ox sample and the Aachen Assisted Leaching (AAL) sample.
Analysis of Tensile and Bending Strength of Coconut Fiber Reinforcement Composite on Quasi Isotropic Laminates Stacking Sequence Aminur, Aminur; Saputra, Jaka Seru Dwi; Syah, Citra Yurnidar
Journal of Metallurgical Engineering and Processing Technology Vol 4, No 2 (February 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v4i2.11350

Abstract

A composite is a material structure composed of two or more combinations of constituents combined macroscopically, where the two combinations do not dissolve each other. The first phase is called reinforcement, while the second phase is called matrix. This study aims to analysis the tensile and bending strength values of coconut fiber reinforced composites with a sequence of layers of quasi-isotropic fiber laminates. Experimental studies were carried out on polyester resin composites reinforced with coconut fiber in the fiber layer sequences of [0°/0°/0°], [+45°/0°/-45°] and [+60°/0°/-60°]. Tensile test specimen standards refer to ASTM D-3039 and bending test standards refer to ASTM D-7264. The results of the blistering test obtained a maximum stress of 18.3298 N/mm2 in the fiber layer sequence [0°/0°/0°] and a minimum stress of 10.8966 N/mm2 in the fiber layer sequence [+60°/0°/ -60°]. Meanwhile, the bending test results showed that the maximum bending stress was 76.065 N/mm2 in the fiber layer sequence [0°/0°/0°] and the minimum stress was 30.256 N/mm2 in the fiber layer sequence [+45°/0°/-45 °].
Theoretical approach on characterizing structural and mechanical properties of industrial alloys Ramadhan, Muhammad Redo; Khansa, Salwa Anindhita; Zulindra, Qoriana; Amalia, Dwi; Astuti, Fahmi
Journal of Metallurgical Engineering and Processing Technology Vol 4, No 2 (February 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v4i2.11351

Abstract

With the goal of entering Indonesia’s golden dream 2045 in mineral technology and utilizations, expansive researches covering both experimental and theoretical aspects are urgently required. Here, we provide theoretical study on structural and mechanical properties of various nickel-based alloys based on first-principles, density functional theory (DFT) technique. First, we evaluate the accuracy of several exchange-correlation functionals (LDA-PZ, GGA-PBE, GGA-PBEsol) by comparing the calculated lattice constants for each system with the known experimental results. Based on the best functional, we analyze structural changes caused by the mixture of different atom to the principal element of nickel. Finally, we derived the related mechanical properties for all systems based on the calculated elastic constants. Furthermore, the elastic constants can also be used to predict the stability of alloy structure.
AAS and XRD Analysis of Gold Ore Bioflotation Results with Aloe Vera as an Environmentally Friendly Reagent Mantika, Sabrina; Prillasasti, Farra Diva; Nugrah Aurigha, Evan; Amelia, Rike; Rickiadi, M. Fajar; Wahyuningsih, Tri
Journal of Metallurgical Engineering and Processing Technology Vol 4, No 2 (February 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v4i2.11394

Abstract

Flotation is a mineral concentration method that involves floating the minerals so that they can be separated from the gangue by the addition of reagents. The reagents used are chemicals such as frother and collector, which can potentially contaminate the environment. This research explores the potential use of aloe vera as a separating reagent in environmentally friendly gold ore flotation. The feed used consists of 300 grams of gold ore, and the flotation time is set at 15 minutes. XRD analysis is employed to determine the types of minerals contained in the sample, revealing that the sample consists of 97.64% quartz; Enstatite, syn 1.21%; and Clinochlore-1A 1.16%. Atomic Absorption Spectrophotometry (AAS) is the technique used to determine the metal concentration in a sample. AAS analysis indicates an Au concentration in the feed of 3.94 ppm. The Au concentration in the concentrate with the addition of aloe vera extract is 10.57, and in the tailings, it is 0.92, higher than the concentration in the concentrate without the addition of aloe vera extract, which is 10.11, with 1.89 in the tailings. The %recovery from these concentrations with the addition of aloe vera extract is 84.06%, while without the addition of aloe vera extract, it is 63.78%. This study provides evidence that the use of aloe vera in the gold ore flotation process can be a sustainable and environmentally friendly alternative in the effort to improve the separation of valuable minerals from impurities.
The Effect of Aloe Vera Bioreagent as a Frother and Collector in the Gold Ore Flotation Process on Increasing Grade and Recovery Asna, Aufa; Songli, Azalia; Nabilah, Rizka; Ikhsan, Syahwanul; Rickiadi, M. Fajar; Wahyuningsih, Tri
Journal of Metallurgical Engineering and Processing Technology Vol 4, No 2 (February 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v4i2.11395

Abstract

One of the concentration processes in processing sulfide gold ore is the flotation technique which takes advantage of differences in mineral surface properties by adding chemical reagents. The addition of chemical reagents to the flotation process can cause environmental problems. Therefore, efforts are needed to replace chemical reagents with more environmentally friendly materials. In this research, an attempt was made to replace chemical reagents with a commonly found plant extract, namely aloe vera, as a bioreagent. Bioflotation experiments on a laboratory scale were carried out using a Denver flotation cell with an aloe vera reagent as a frother. This gold mineral bioflotation experiment was carried out on a 150 mesh size fraction. The results of increasing concentrate levels by flotation indicate that the aloe vera reagent as a frother is able to produce biosurfactants which replace chemical reagents as a more environmentally friendly biofrother and biocollector. This can be concluded based on flotation experiment data with bioreagent which has been tested showing an Au content value of 10.09 and a recovery of 96.15%, while flotation using chemical reagents shows an Au content value of 10.50 and a recovery of 95.96%. So the use of aloe vera as an environmentally friendly bioreagent in the flotation process releasing low sulfidation gold is more effective than the use of chemical reagents because it is indicated that there is a biosurfactant content in aloe vera.
Implementation of Metallurgical Industry Management Using the DMAIC Method in TS Aluminum Hafiz Faturrahman, Muhammad; Khayyan Bahiy, Oktavian; Carlotta, Nixon Carlotta; Amalia, Yasmina
Journal of Metallurgical Engineering and Processing Technology Vol 4, No 2 (February 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v4i2.11432

Abstract

The case study in this research comes from the TS Aluminum company in Yogyakarta. This research aims to reduce the number of defects in metal in the casting process from an industrial management point of view. This research method uses quantitative and qualitative methods through literature studies and experimental data with the DMAIC method.From the results of production and marketing carried out with a production volume of 250 pcs per day, there were 4% failures in the products produced. Defects that often occur are rat tail defects, cold shot, and porosity. Defects are caused by factors such as human error, methodology, and materials. Recommendations for improvement include providing regular training to employees, updating work procedures, and checking materials.
Optimization of Acid Wash Process on Activated Carbon with Variation of HCL Concentration at PT XYZ Ardian, Fahny; Putra, Infantri; Nasuci, Figo S. M.; Wonua, Karla Jeclin; Purba, Janres Yoseva
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 1 (August 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i1.11943

Abstract

The acid wash process is used as a unit operation in the gold adsorption route with the primary objective of removing calcium carbonate, magnesium, and sodium salts from gold-rich carbon surfaces. In general, the use of HCl with an initial concentration of 3% (w/v) and immersion for 1 hour with 1 bed volume of acid can achieve calcium removal of more than 95% from the carbon surface. This research involved reducing the HCl concentration from 3% to varying concentrations between 1%, 1.25%, 1.5%, 1.75%, 2%, 2.25%, 2.5%, and 2.75% with the aim is to optimize the use of HCl and increase economic efficiency in the acid wash process. Analysis of carbon activity data shows that the acid wash process does not have a significant effect on carbon reactivation. The research method involves collecting activated carbon samples in three types, namely Loaded Carbon (LC), Carbon After Wash (CAW), and Barren Carbon (BC). The samples were then analyzed using the Carbon hardness test to evaluate the level of impurities on the carbon surface, as well as the Carbon activity test to measure carbon absorption activity. Data on gold and silver recovery results was also collected from the elution process. The research results show that an HCl concentration of 2% provides optimal effectiveness in acid wash. At this concentration, desorption results were achieved that met the ADR KPI, confirming that acid wash did not significantly affect the gold desorption process. In addition, the acid wash efficiency at a concentration of 2% is close to the baseline value, indicating a good ability to clean carbon from impurities. In the context of this study, acid washing has been proven to be an effective method for cleaning activated carbon for gold adsorption. These findings provide an important contribution to improving the efficiency and quality of the gold absorption process.
Behavior of welded joints on the roof truss of KOJK Office using LISA V.8 FEA Efendi, Aco Wahyudi
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 1 (August 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i1.12020

Abstract

Welded joints play a crucial role in the structural integrity of buildings, particularly in supporting heavy loads and resisting various forces such as wind, seismic, and gravitational loads. This research was carried out by identifying the stresses that occur in the welded joints of the truss trusses of the roof of the KOJK Central Java building, with initial analysis conditions of rigid and stiff connections, and second conditions with conditions that occur according to field findings, where the joints are non-standard and there are several holes due to welding. not perfect. Modeling analysis uses Finite Element Analisys software, namely LISA V.8 FEA (License), to obtain the stress behavior that occurs in the roof truss elements of KOJK Central Java. From the results of analysis and modeling by making two conditions, namely the condition of welding joints according to standards and welding joints under field conditions. The stress ratio at the weld joint is 1.351 and the stress ratio at the truss pull rod is 1.054.
Beneficiation of Coal from Bonehau, Mamuju Regency of West Sulawesi Province Using Column Flotation William, Gabriel Wendiarto; Sufriadin, Sufriadin
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 1 (August 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i1.12196

Abstract

Coal is a heterogeneous substance with organic and inorganic and associated with a number of mineral matters that can reduce coal quality. Coal combustion will convert mineral matters into ash content that can affect furnace performance. Coal beneficiation is the process of improving coal quality with a number of methods to reduce ash content and increase coal calorific value. One of the coal beneficiation method is flotation which involves a solid phase in the form of coal particles, a liquid phase in the form of water, and a gas phase in the form of air bubbles as factors that affect the flotation process. This study aims to determine the coal quality, and to analyze the effect variables on ash content and calorific value. The methods used in this study were microscopic optical and X-Ray Diffraction (XRD) analysis for coal mineralogy and proximate analysis and calorific value analysis for coal quality. The column flotation method using flotation time, grain size, and collector dosage as research variables. The results of coal mineralogy analysis showed the coal sample contained of quartz, pyrite, moganite, and graphite with 5.07% of ash and 5,207 cal/g of calorific value. Results of the flotation experiment reveal that the lowest ash content were 2.83% which was found with the grain size of 60 mesh, a flotation time of 10 minutes, and 20 mL of collector dose. The highest calorific value analysis results were 5,835 cal/g which obtained at a grain size of 100 mesh, flotation time of 15 minutes, and a collector dose of 20 mL.
Analysis Effect of the Nickel Ore Reduction Process on Sulfur Fixation in Reduction Kiln #5 at PT Vale Indonesia Tbk Using Factsage Simulation Sukamto, Untung; Furrie Mutia Rahma, Aufa Asna
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 1 (August 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i1.12351

Abstract

The pyrometallurgical process which produces a product in the form of matte nickel is a nickel product that contains high sulfur so it is necessary to carry out a calcination process with the addition of sulfur and coal in the process using a reduction kiln. In order to increase the effectiveness of the process, PT Vale Indonesia Tbk's reduction kiln operations underwent several improvisations regarding the parameters used in the reduction kiln to adapt to the ore and changes to the equipment. This research aims to obtain optimal conditions for the reduction and sulfidation process to produce nickel in a reduction kiln with low fuel consumption. This research stage was carried out by making direct observations in the field as material for assessing actual conditions, then carrying out simulations using Factage software to obtain ideal conditions. Factage simulation results show an optimal calcine composition with 1.95% Ni; 25.86% Fe; 5.03%C; 63.28% Mg2Si2O6; and 3.03% Mg2SiO4 with a good calcine temperature of 717oC and federate at a kiln reduction of 767 DMT and the maximum sulfur fixation value obtained was 1.3 because sulfur and coal were added at the ideal dose, namely 9 kg/t and 35 kg/t.

Page 12 of 13 | Total Record : 129

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